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| Month | Race Name | Events | Location | Near | |
| March | Prickly Pear | 50 km, 10 mi | TX, United States | San Antonio | |
| March | Antelope Island Buffalo Run | 50 mi, 50 km, 25 km | UT, United States | Syracuse | |
| March | Hinte-Anderson Trail (HAT) Run | 50 km | MD, United States | Aberdeen | |
| March | Foot Pursuit 5K | 5 km | IN, United States | Valparaiso | |
| March | Land Between the Lakes Ultra Trail Runs | 50 mi, 60 km, 26.2 mi, 23 km | KY, United States | Grand Rivers | |
| March | Laughlin Half Marathon & 5K | 13.1 mi, 5 km | NV, United States | Laughlin | |
| March | Marin Trail 10K & 20K | 20 km, 10 km | CA, United States | San Rafael | |
| March | Way Too Cool 50K | 50 km | CA, United States | Cool | |
| March | Catalina Marathon | 26.2 mi, 10 km, 5 km | CA, United States | Avalon | |
| March | Romancing the Island | 25 km, 12 km | CA, United States | Tiburon | |
| March | Spring Mountain Highway Madness | 60 km, 45 km, 30 km, 15 km | BC, Canada | North Vancouver | |
| March | Napa Valley Trail Marathon, Half Marathon & 10K | 26.2 mi, 13.1 mi, 10 km | CA, United States | Calistoga | |
| March | Pirates Cove Trail Run | 50 km, 30 km, 20 km, 8 km | CA, United States | Sausalito | |
| March | Grasslands Run | 50 mi, 26.2 mi, 13.1 mi | TX, United States | Decatur | |
| March | Burnaby Mountain Run | 22.4 km, 11.2 km | BC, Canada | Burnaby | |
| March | Bel Monte Endurance Run | 50 mi, 50 km, 25 km | VA, United States | Charlottesville | |
| March | Terrapin Mountain Marathon & 1/2 Marathon | 26.9 mi, 13.1 mi | VA, United States | Sedalia | |
| March | Diablo Trails Challenge | 32.1 mi | CA, United States | Walnut Creek | |
| March | Napa Valley Half marathon | 13 mi | CA, United States | Napa | |
| April | Red Mountain 50k | 50 km, 30 km | UT, United States | St. George | |
| April | Golden Gate Headlands | 26.2 mi, 13.1 mi, 7 mi | CA, United States | Sausalito | |
| April | Flatwoods Four Trail Race | 4 mi | FL, United States | Tampa | |
| April | Mt Penn Mudfest | 15 km | PA, United States | Reading | |
| April | Muir Woods Marathon, 25K & 7 Mile | 26.2 mi, 25 km, 7 mi | CA, United States | Stinson Beach | |
| April | Diablo Marathon & 50 Mile Endurance Run | 50 mi, 26.2 mi | CA, United States | Clayton | |
| April | Desert R.A.T.S. 25/50 Mile | 50 mi, 25 mi | CO, United States | Fruita | |
| April | Rockin K Trail Run | 50.6 mi, 26.3 mi | KS, United States | Ellsworth | |
| April | The North Face Endurance Challenge | 50 mi, 50 km, 13.1 mi, 10 km | NY, United States | Fort Montgomery | |
| April | Desert R.A.T.S. 5/10 Mile | 10 mi, 5 mi | CO, United States | Fruita | |
| April | John Bryan 50K | 50 km | OH, United States | Dayton | |
| April | Ouachita Trail 50 Mile and 50K | 50 mi, 50 km | AR, United States | Little Rock |
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